Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Para o registro do século XVII de ɐ, o que são vogais iniciais semi-fechadas átonas?
 ###Tabelas: CREATE TABLE initial_unstressed_syllables (initial_unstressed_syllables_id AUTO_INCREMENT PRIMARY KEY, Semi-closed initial unstressed vowels VARCHAR, 17th c. VARCHAR, American VARCHAR, Australian VARCHAR, Examples VARCHAR) CREATE TABLE belfast_and_northern_counties_railway_1848–1903__&__northern_counties_committee_1903–1949 (belfast_and_northern_counties_railway_1848–1903__&__northern_counties_committee_1903–1949_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Type VARCHAR, Fleet numbers VARCHAR, Quantity made INT, Manufacturer VARCHAR, Date made VARCHAR, Date withdrawn VARCHAR) CREATE TABLE cd_releases (cd_releases_id AUTO_INCREMENT PRIMARY KEY, Catalog # VARCHAR, Title VARCHAR, Year VARCHAR, Composer VARCHAR, Released INT) CREATE TABLE the_people (the_people_id AUTO_INCREMENT PRIMARY KEY, Ethnic group VARCHAR, Totora Municipality (%) INT, Pojo Municipality (%) INT, Pocona Municipality (%) INT, Chimoré Municipality (%) INT, Puerto Villarroel Municipality (%) INT, Entre Ríos Municipality (%) INT) CREATE TABLE trans-am_series (trans-am_series_id AUTO_INCREMENT PRIMARY KEY, Year INT, Date VARCHAR, Drivers VARCHAR, Distance/Duration VARCHAR, Race Title VARCHAR)  
SELECT Semi-closed initial unstressed vowels FROM initial_unstressed_syllables WHERE 17th c. = ɐ